1. I.L. Weissman, M. Small, C.G. Fathman, and L.A. Herzenberg. Fed. Proc. 34:142 (1975).
2. A.M. Duijvestijn, and E.C.M. Hoefsmit. Cell Tiss. Res. (1981) in press.
3. R.V. Rouse, W. v. Ewijk, P.P. Jones, and I.L. Weissman. J. Immunol. 122:2508 (1979).
4. E. Raviola, and M.J. Karnovsky. J. Exp. Med. 136:466 (1972).
5. D.I. Beller, and E.R. Unanue. J. Immunol. 121:1861 (1978).